StacksVerified U.S. regulatory reference

46 CFR §144.605

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Means must be provided for stopping each fan in a ventilation system serving machinery spaces and for closing, in case of fire, each doorway, ventilator, and annular space around funnels and other openings into such spaces.